EP 0450495 B1 19951122 - Continuously variable traction roller transmission with a hydraulic control system.
Title (en)
Continuously variable traction roller transmission with a hydraulic control system.
Title (de)
Stufenlos regelbares Toroidgetriebe mit hydraulischem Steuerungssystem.
Title (fr)
Transmission continue de vitesse à rouleaux de traction avec un système de commande hydraulique.
Publication
Application
Priority
JP 8962690 A 19900404
Abstract (en)
[origin: EP0450495A2] A hydraulic control system for a continuously variable traction roller transmission comprises a shift control valve for controlling hydraulic pressure within a hydraulic cylinder apparatus. The shift control valve includes a sleeve and a spool received therein for relative motion, which assume a normal state when a gear ratio commanded corresponds to a rotational displacement of rotation shanks of roller support members wherein the hydraulic cylinder apparatus provides a predetermined force to the rotation shanks in an axial direction thereof so as to preserve a rotational displacement of the rotation shanks. The sleeve has a plurality of bores for discharging hydraulic fluid to be supplied to the hydraulic cylinder apparatus. The bores are fluidly communicated when a relative displacement between the sleeve and the spool with regard to the normal state is greater than a predetermined value, whereas the bores fail to be fluidly communicated when the relative displacement is smaller than the predetermined value. <IMAGE> <IMAGE>
IPC 1-7
IPC 8 full level
F16H 15/38 (2006.01); F16H 61/02 (2006.01); F16H 61/06 (2006.01); F16H 61/28 (2006.01); F16H 61/662 (2006.01)
CPC (source: EP US)
F16H 15/38 (2013.01 - EP US); F16H 61/6648 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0450495 A2 19911009; EP 0450495 A3 19920115; EP 0450495 B1 19951122; DE 69114747 D1 19960104; DE 69114747 T2 19960418; JP 2663672 B2 19971015; JP H03288062 A 19911218; US 5136890 A 19920811
DOCDB simple family (application)
EP 91104910 A 19910327; DE 69114747 T 19910327; JP 8962690 A 19900404; US 67415391 A 19910325